Portable tray



FIG. 1 is a perspective view of a portable tray, showing my new design;

FIG. 2 is a side elevational view, the opposite side being a mirror image thereof;

FIG. 3 is a top plan view;

FIG. 4 is a front elevational view;

FIG. 5 is a bottom plan view; and

FIG. 6 is a rear elevational view. 

The ornamental design for a portable tray, as shown and described. 